code: def get_metric(self, reset=False):
      if self._num_gold_mentions == 0:
          recall = 0.0
      else:
          recall = self._num_recalled_mentions / float(
              self._num_gold_mentions
          )
      if reset:
          self.reset()
      return recall
  
file_path: magnitude/pymagnitude/third_party/allennlp/training/metrics/mention_recall.py
imports: from __future__ import division
  from __future__ import absolute_import
  import torch
  from allennlp.training.metrics.metric import Metric
label_desc: Use image node_id 3 for calling the MentionRecall obj's underlying member method code with example usage: obj.get_metric(reset) and returns: recall